WHEAT* >'![) 



These principles he owns to he well founded, 

 hut contends that the benefit arising from 



harrowing and rolling is not derived from 

 pulverising the soil alone, but from subdivid- 

 ing and enabling the plants to " tiller," as it 

 is termed. " The harrow (he observes) cer- 

 tainly breaks the incrustation, and the roller 

 crumbles the clods ; but the harrow removes 

 many of the plants from their original sta- 

 tions ; and if the corn has begun to tiller at 

 the time it is used, the roots will be, in many 

 instances, subdivided, and then the applica- 

 tion of my system of divisibility comes into 

 play. The roller then serves to plant the 

 roots which have been torn up by the har- 

 row." But on this the Society observe, that 

 the teeth of a harrow are too large to divide 1 

 roots so small and tenacious as those of grain ; 

 and whenever such roots stand in the line 

 any tooth makes, they will, if small, be only 

 turned on one side, by the earth yielding to 

 their lateral pressure ; or, if large, the whole 

 root will be drawn out of the ground. The 

 principal uses, therefore, derived from har- 

 rowing and rolling these crops are, opening 

 the soil between the plants, earthing them 

 up, breaking the clods, and closing the earth 

 about their roots. 



